A tutorial on how to make a light sensor circuit and dark detector circuit using 555 timer IC and a few other electronics components. When this circuit is configured as a light sensor circuit, it turns ON the output whenever light around the LDR is more than a certain amount (threshold). This threshold can be adjusted by using a potentiometer.
Similarly, when this circuit is configured as a dark sensor circuit, it turns ON the output whenever light around the LDR is less than a certain threshold. So the behavior is opposite to that of light sensor. This arrangement can be used in automatic street light circuits to turn the light ON and OFF automatically depending on how bright it is.

Link to the project page and circuit diagram: https://elonics.org/light-sensor-and-...

Components Required:
* 555 IC
* LDR (Light Dependent Resistor or Photo-Resistor)
* LED, Buzzer or any Output Device of your choice
* Resistors: 2 x 10K, 270R (For LED)
* Breadboard
* Few Breadboard Connectors
* (5-12)V of Power Supply


This tutorial is a part of 18 video series on Electronic Projects created using IC 555:    • 555 Timer Projects on Breadboard With...  
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